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x in (-oo:+oo)
(7/2)*x = 20/3 // - 20/3
(7/2)*x-(20/3) = 0
(7/2)*x-20/3 = 0
7/2*x-20/3 = 0 // + 20/3
7/2*x = 20/3 // : 7/2
x = 20/3/7/2
x = 40/21
x = 40/21
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